export default {
  // 开启命名空间
  namespaced: true,
  
  state:() =>({
    cart:JSON.parse( uni.getStorageSync('cart')||'[]')
    
  }),
  mutations: {
    addToCart(state,goods){
      const findResult = state.cart.find(x=>x.goods_id === goods.goods_id)
      if(!findResult){
        goods.goods_count = 1
        state.cart.push(goods)
      }else{
        findResult.goods_count++
      }
      this.commit('m_cart/saveToStorage')
    },
    saveToStorage(state){
      uni.setStorageSync('cart',JSON.stringify(state.cart))
    },
    //更新购物车的状态方法
    updateGoodsState(state,goods){
      const findResult= state.cart.find(x=> x.goods_id === goods.goods_id)
      if(findResult){
        findResult.goods_state = goods.goods_state
        
          this.commit('m_cart/saveToStorage')
      }
    },
    // 更新商品的数量
    updateGoodsCount(state,goods){
      const findResult = state.cart.find(x=>x.goods_id===goods.goods_id)
      if(findResult){
        findResult.goods_count = goods.goods_count
         this.commit('m_cart/saveToStorage')
      }
    },
    //根据id删除对应的商品
    removeGoodsById(state,goods_id){
      state.cart = state.cart.filter(x=>x.goods_id!==goods_id)
       this.commit('m_cart/saveToStorage')
    },
    //更新购物车中所有商品的勾选状态
    updateAllGoodsState(state,newState){
      state.cart.forEach(x=>x.goods_state = newState)
      this.commit('m_cart/saveToStorage')
    }
  },
  
  getters: {
    // 购物车中所有商品的总数量
    total(state){
      // let c = 0
      // state.cart.forEach(x=>c+=x.goods_count)
      // return c
      return state.cart.reduce((total,item)=>total+=item.goods_count,0)
    },
    // 购物车中已勾选商品的总数量
    checkedCount(state){
      return state.cart.filter(x=>x.goods_state).reduce((total,item)=>
         total += item.goods_count
      ,0)
    },
    //已勾选商品的总数量
    checkedGoodsAmount(state){
      return state.cart.filter(x=>x.goods_state).reduce((total,item)=>total+=item.goods_count*item.goods_price,0).toFixed(2)
    }
  }
}